The2011 of the Pacific coast of Tohoku Earthquake caused the damages of mooring facilities, such as seaward displacement of quay walls and subsidence of backfill ground. It is supposed that ground surface subsidence at quays reclaimed with coarse-grained rock waste were influenced by its volume con-traction characteristic during earthquake.
　In this paper, we conducted shake table tests with shear box, indicating the relationship between the volumetric strain and relative density of coarse-grained rock waste. Further, conducting shake table test of gravity type quay wall, it is clarified that horizontal displacement of the gravity type quay is less dependent on density of the coarse-grained rock waste. Effective stress analysis was carried out to reproduce the results of the shear box test and the model quay wall test, using the same model parameters for the coarse-grained rock waste. In addition, in situ measurement procedure of density of coarse-grained rock waste was examined, that is necessary to evaluate seismic behavior of real quay walls.